Acta Mechanica Sinica

, Volume 34, Issue 2, pp 257–265 | Cite as

Mobile bed thickness in skewed asymmetric oscillatory sheet flows

Review Paper
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Abstract

A new instantaneous mobile bed thickness model is presented for sediment transport in skewed asymmetric oscillatory sheet flows. The proposed model includes a basic bed load part and a suspended load part related to the Shields parameter, and takes into account the effects of mass conservation, phase-lag, and asymmetric boundary layer development, which are important in skewed asymmetric flows but usually absent in classical models. The proposed model is validated by erosion depth and sheet flow layer thickness data in both steady and unsteady flows, and applied to a new instantaneous sediment transport rate formula. With higher accuracy than classical empirical models in steady flows, the new formula can also be used for instantaneous sediment transport rate prediction in skewed asymmetric oscillatory sheet flows.

Keywords

Mobile bed thickness Phase-lag Sediment transport Sheet flow Skewed asymmetric oscillatory flow 

Notes

Acknowledgements

The project was supported by the National Natural Science Foundation of China (Grants 51609244, 11472156, and 51139007) and the National Science-Technology Support Plan of China (Grant 2015BAD20B01)

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Copyright information

© The Chinese Society of Theoretical and Applied Mechanics; Institute of Mechanics, Chinese Academy of Sciences and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  1. 1.Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network SystemChina Agricultural UniversityBeijingChina
  2. 2.Tianjin Centre, China Geological SurveyTianjinChina

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